PDF malware analysis — malicious · 6dbb075589e41554

MALICIOUS

PDF

85.6 KB Created: 2021-10-12 07:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: b6ca707543ba85eaab017c8319abd1a3 SHA-1: 045782d86c457319852cd1d271d2084aea5d45e3 SHA-256: 6dbb075589e41554bfba1c5e6495d3a985325b5ca680893b50091b53321fe650

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to suspicious PDF files on unknown hosts. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147464c2a757---debuzexogapupo.pdf In PDF document text
- http://softtox.com/new/userfiles/file/91690357761.pdfIn PDF document text
- http://friend5190.xyz/js/ckfinder/userfiles/files/buzamenosolapo.pdfIn PDF document text
- http://texmet.pl/userimages/file/zenunasuputawakirukisi.pdfIn PDF document text
- https://mackbeks.com/files/file/68824301611.pdfIn PDF document text
- http://appli-veolia.net/ckfinder/userfiles/files/41500496335.pdfIn PDF document text
- https://comobrew.com/newsite/images/user_uploads/file/97092555685.pdfIn PDF document text
- http://minipit.com/data/files/37305960449.pdfIn PDF document text
- http://kamakuralosgatos.com/uploads/files/22011716880.pdfIn PDF document text
- https://y3stwk65l-mn9.com/contents/files/22605750964.pdfIn PDF document text
- https://kopari.hu/files/file/konutivisojozajoxotuga.pdfIn PDF document text
- http://xn--or3bi2da319p.com/upload/fckeditor/file/wenerise.pdfIn PDF document text
- https://klcmekatronik.com/ckfinder/userfiles/files/53902199911.pdfIn PDF document text
- http://pspectr.ru/userfiles/file/78829177630.pdfIn PDF document text
- http://sushiloverca.com/uploads/files/95860702492.pdfIn PDF document text
- https://ipkameros.lt/userfiles/file/tikonozodikasidaxokudage.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9ghgilot26k1b599rtm9sv8sjp/jikigu.pdfIn PDF document text
- http://olympusflights.com/files/files/gobovise.pdfIn PDF document text
- http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/62214630508.pdfIn PDF document text
- https://emons-verlag.com/testarea/cwsCMSlight/media/files/fapugetinosumanuselog.pdfIn PDF document text
- https://nic-irq.com/userfiles/files/wikefejawunuzax.pdfIn PDF document text
- https://clickbox.ro/images/file/fajetilowupigagilu.pdfIn PDF document text
- http://fuhua.tumujike.com/assets/upload/files/202109032121182403.pdfIn PDF document text
- http://mayphatdienngocquang.com/media/ftp/file/19230767451.pdfIn PDF document text
- http://talesma.com/E/file/ribasujubiwirani.pdfIn PDF document text
- http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=american+gizzard+shadPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e760.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE760	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ff72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF72	19400 bytes
SHA-256: `d111dfe096926f682b9facfefa1c63c5fd5955472a23b4d3c769cf39830e4742`
`font_02_sfnt_off000130e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130E9	10592 bytes
SHA-256: `6f4793a7aa4b422f9c0b3095c6d207c69352a6196a3f155c9a1150d01913a412`

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